Did ya'll notice a slimmer MIRANDA LAMBERT at Wednesday's CMAs? It even came up backstage . . . and she was gracious enough to NOT be insulted. 

She explained, quote, "I've been working out. I just felt that I should get a little more healthy . . . maybe get ahead of the game. I'm going to be 30 on Sunday. I thought, maybe if I get ahead of it I won't have to work so hard later in life."  

Sounds like she dropped the weight by cutting back on the junk food. She said, quote, "I didn't give up really a lot really. Just Cheetos, mostly. But I might have some tonight, just to celebrate."

People.com has side-by-side pics of her from the Kentucky Derby back in May, and from Wednesday's CMAs.

She's doesn't look that much thinner, thankfully. I mean, she's "not naturally small" . . . and I like that about her. Miranda, darlin' . . . you look BEAUTIFUL. Just like you are!